6.Jfinal分页实例

1.创建web项目，导入jfinal，mysql,jsp相关依赖

2.项目结构

3.在res中添加jdbc.txt
修改为自己的数据库

jdbcUrl = jdbc:mysql://localhost/test?characterEncoding=utf8
user = root
password = admin
devMode = true
showSql = true

我的数据库如下，这里可以自己定义

4.创建主配置类
DemoConfig.java

public class DemoConfig extends JFinalConfig{
    @Override
    public void configConstant(Constants arg0) {
        arg0.setViewType(ViewType.JSP);
        loadPropertyFile("jdbc.txt");   
    }
    @Override
    public void configHandler(Handlers arg0) {
        //项目根路径
        arg0.add(new ContextPathHandler("baseUrl"));   
    }
    @Override
    public void configInterceptor(Interceptors arg0) {

    }
    @Override
    public void configPlugin(Plugins arg0) {
        C3p0Plugin c3p0=new C3p0Plugin(getProperty("jdbcUrl"),
                getProperty("user"),               
                getProperty("password"));      
        arg0.add(c3p0);
        ActiveRecordPlugin activeRecord=new ActiveRecordPlugin(c3p0);
        activeRecord.addMapping("user",User.class);
        arg0.add(activeRecord);    
    }
    @Override
    public void configRoute(Routes arg0) {
        arg0.add("page",PageController.class,"view");
     //对应第八步                                        
    }
    public static void main(String[] args) {
        JFinal.start("WebContent", 80, "/", 5);
    }

}

5.修改web.xml,加入jfinal过滤器（servlet)

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

  <display-name>jfinal_demodisplay-name>
    <filter>
        <filter-name>jfinalfilter-name>
        <filter-class>com.jfinal.core.JFinalFilterfilter-class>
        <init-param>
            <param-name>configClassparam-name>
            <param-value>com.cjq.config.DemoConfigparam-value>
        init-param>
    filter>
    <filter-mapping>
        <filter-name>jfinalfilter-name>
        <url-pattern>/*url-pattern>
    filter-mapping>
web-app>

6.在com.cjq.model包下创建User.java

public class User extends Model<User>{

    public static final User dao=new User();

}

7.在com.cjq.service中创建UserService.java

public class UserService {
    /**
     * 
     * @param pageNum页号
     * @param pageSize每页几条记录
     * @return
     */
    public static Page pagInate(int pageNum,int pageSize){               
        return User.dao.paginate(pageNum, pageSize,"select *","from user");
    }
}

8.在com.cjq.controller创建PageController.java

public class PageController extends Controller {
   final  int PAGE_SIZE=2;//默认每页2条记录
    /**
     * 初始页为第一页
     */
    public void index(){
        System.out.println("--------------");
        List list=UserService.pagInate(1,PAGE_SIZE).getList();
        //renderJson(list);
        setAttr("list", list);
        setAttr("pageNum",UserService.pagInate(1,PAGE_SIZE).getPageNumber());
        setAttr("totalPage",UserService.pagInate(1,PAGE_SIZE).getTotalPage());
        render("page.jsp");
    }
    /**
     * 上一页
     */
     public void getBefore(){

            int pageNum=getParaToInt();
            List list=UserService.pagInate(pageNum,PAGE_SIZE).getList();

            setAttr("list", list);
            //获取当前页号
            setAttr("pageNum",UserService.pagInate(pageNum,PAGE_SIZE).getPageNumber());
            //获取总页数
            setAttr("totalPage",UserService.pagInate(pageNum,PAGE_SIZE).getTotalPage());
            render("page.jsp");
         }
     /**
      * 下一页
      */
     public void getAfter(){

           int pageNum=getParaToInt();
            List list=UserService.pagInate(pageNum,PAGE_SIZE).getList();

            setAttr("list", list);
            setAttr("pageNum",UserService.pagInate(pageNum,PAGE_SIZE).getPageNumber());
            setAttr("totalPage",UserService.pagInate(pageNum,PAGE_SIZE).getTotalPage());
            render("page.jsp");
         }
}

9.在view目录下新建page.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib prefix="c"  uri="http://java.sun.com/jsp/jstl/core"%>

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title heretitle>
head>
<body>

        <table border="1px">
            <tr >
                <th>idth>
                <th>姓名th>
                <th>年龄th>
                <th>密码th>
            tr>
            <c:forEach items="${list}" var="l">
            <tr >
                <td>${l.id}td>
                <td>${l.name}td>
                <td>${l.age}td>
                <td>${l.password}td>
            tr>
            c:forEach>
        table>


        <div class="page">
            <a class="prev" href="#">上一页a> <input type="text" id="pageNum"
                value="${pageNum}" readonly="true" /> <a class="next" href="#">下一页a>
            共<input type="text" id="totalPage" value="${totalPage}"
                readonly="true">页
        div>



    <script type="text/javascript" src="${baseUrl}/js/jquery.js">script>
    <script type="text/javascript">
        $(function() {
            /**
            点击上一页触发
            **/
            $(".prev").click(function() {
                    var pageNum = $("#pageNum").val();
                    pageNum = parseInt(pageNum);
                    if (pageNum == 1) {
                        alert("当前已经是第一页");
                    } else {
                        pageNum--;
window.location.href = "${baseUrl}/page/getBefore/"+ pageNum;
                        }
               });
            /**
        点击下一页触发
            **/
            $(".next").click(function() {
                    var pageNum = $("#pageNum").val();
                    var totalPage = $("#totalPage").val();
                    pageNum = parseInt(pageNum);
                    if (pageNum == totalPage) {
                        alert("当前已经是最后一页");
                    } else {
                        pageNum++;
  window.location.href = "${baseUrl}/page/getAfter/"+ pageNum;
                            }
                    });

        })
    script>

body>
html>

10.运行DemoConfig.java类中main方法

11.页面有些难看，在这里不展示，可以自行调节样式